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3 years ago

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Mathematics

1 answer:

Tju [1.3M]3 years ago

3 0

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cricket20 [7]

Answer:A.,C.,D that is the answer

Step-by-step explanation:

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3 years ago

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natka813 [3]

The answer is the first one:

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In the third week of July, a random sample of 40 farming regions gave a sample mean of x = $6.88 per 100 pounds of watermelon. A

suter [353]

Answer:

a. [6.6350,7.3950]

b. ME=0.5150

Step-by-step explanation:

a. Given that n=40, $\bar x=6.88$ and that: $z_{\alpha/2}=z_{0.05}=1.645$

The required 90% confidence interval can be calculated as:

$\bar x\pm(margin \ of \ error)\\\\\bar x\pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}\\\\6.88\pm(1.645\times \frac{1.98}{\sqrt{40}})\\\\=[6.3650,7.3950]$

Hence, the 90% confidence interval for the population mean cash value of this crop is [6.6350,7.3950]

b. The margin of error at 90% confidence interval is calculated as:

$ME= z_{\alpha/2}\frac{\sigma}{\sqrt{n}}\\\\=(1.645\times \frac{1.98}{\sqrt{40}})\\\\=0.5150$

Hence, the margin of error is 0.5150

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3 years ago

Alexandra has a stand in the marketplace where she sells ground cumin she has a fixed amount of weekly expenses she sells her cu

igor_vitrenko [27]

Answer:

Her weekly expenses is $234

Step-by-step explanation:

At $7.20 per kilogram

From selling 90 kg, she will have

$7.20 × 90

= $648

If her net profit is $414

To get her expenses, we subtract net profit from total income

$648 - $414

= $234

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3 years ago

The math club surveyed 100 students about the number of math courses in which they were enrolled and the weight of their backpac

olya-2409 [2.1K]

Answer:

number of math cpurses: discrete. weight of backpacks: continuous

Step-by-step explanation:

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3 years ago